cache interface (#1805)

cache/cache.go

@@ -0,0 +1,17 @@
+// Package cache is a caching interface
+package cache
+
+type Cache interface {
+	// Initialise options
+	Init(...Option) error
+	// Get a value
+	Get(key string) (interface{}, error)
+	// Set a value
+	Set(key string, val interface{}) error
+	// Delete a value
+	Delete(key string) error
+	// Name of the implementation
+	String() string
+}
+
+type Option struct{}